HVAC systems defined

In assessing the ability of an HVAC system to maintain acceptable humidity levels in the building, the more important performance parameter is the sensible heat ratio (SHR) of the equipment. The SHR is defined as the ratio of the sensible cooling load to the total cooling load. Improved latent performance is characterized by a lower SHR. Defining the relationships between SHR and other dehumidification indices is also convenient. In particular, the latent heat ratio (LHR) can be defined as the latent cooling load fraction, and the latent to sensible ratio (LSR) can be defined as the ratio of latent load to sensible load. These ratios appear as... 

The process of defining areas served by independent HVAC systems. 

Define the activity by the amount of dust generated, the duration of the work, and the amount that could enter HVAC systems. 

The basic industry application, such as HVAC, steel, paper, etc., required of the cooling system, often defines the types of problems that can be anticipated and therefore what to look for and what questions to ask. For example ... 

The biosensor and response system used a tiered approach. Samples of airborne biological material were taken continuously by the Joint Biological Point Detection System (JBPDS) equipment, which was not commercially available. Operation of these systems was monitored continuously at a separate control facility. Initial detection by the JBPDS equipment was followed by a second-tier assay analysis that, if positive, would result in physical collection of sampled material for additional analysis off-site. The confirmed second-tier analysis would result in notification of JBPDS leadership and shipment of a sample to the Utah Department of Health for further laboratory analysis. Because the confirmatory test would take 12-24 hours to complete, the primary function of the higher-tiered detection was to define treatment and decontamination responses (LP-3 options). Change in building or HVAC operation on the fifth and sixth floors would not be initiated until the Utah Department of Health analysis confirmed detection of a biological threat agent. 

The functional link between systems is evaluated via a dependency matrix providing comprehensive overview of system relationships including all relevant support systems, such as HVAC, electrical supply, heat sink, I C, etc. The modular form of FT as defined in 3.1 enables easy linking of support system modules to catch particular dependencies. 

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